A few ideas on how to solve CE test failures… PSU Noise? Try powering the circuit from a battery without the PSU and re-test? This can confirm if PSU is the source of noise. Use a DC power line filter, e.g. Murata BNX016-01 etc If PSU is conducting test noise through it Are low voltage […]
Useful to catch / block high voltage pulses passing through connections such as power supply outputs, power and signal lines leaving a product, etc. Connect across the line to be protected and ground.
Capacitors and EMC
Bypass and Decoupling Capacitors Bypass and decoupling capacitors remove noise from power rails as devices switch, reducing the ringing waveform which creates EMC at the ringing waveforms frequency. They also cause ground currents to return back to the bypass capacitor of the device instead of to the ground input point of the PCB, stopping large loop areas beign created. […]